package demo4;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 86185
 * Date: 2023-03-21
 * Time: 19:55
 */
 class Computer {
    public void powerOn(){
        System.out.println("打开笔记本电脑");
    }
    public void powerOff(){
        System.out.println("关闭笔记本电脑");
    }
    public void useDevice(USB usb){
        usb.openDevice();
        if(usb instanceof Mouse){
            Mouse mouse = (Mouse)usb;
            mouse.click();
        }else if(usb instanceof Keyboard){
            Keyboard keyboard = (Keyboard)usb;
            keyboard.inPut();
        }
        usb.closeDevice();
    }

    public static void main(String[] args) {
        Computer computer = new Computer();
        computer.useDevice(new Keyboard());
        System.out.println("========");
        computer.useDevice(new Mouse());
    }
}



